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Height of a right circular Cone is decre...

Height of a right circular Cone is decreased by `6.25%` and it's radius is increased to `15cm`. Let the volume of cone is decreased by `40%`. Radius of new cone is how much less than previous Cone ?

A

`3` cm

B

`5` cm

C

`3.75` cm

D

`2.5` cm

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The correct Answer is:
C
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